package com.pp.exam.ability.shiro;


import com.pp.exam.ability.shiro.jwt.JwtToken;
import com.pp.exam.ability.shiro.jwt.JwtUtils;
import com.pp.exam.modules.sys.user.dto.response.SysUserLoginDTO;
import com.pp.exam.modules.sys.user.service.SysUserRoleService;
import com.pp.exam.modules.sys.user.service.SysUserService;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

import java.util.HashSet;
import java.util.List;

/**
 * 用户登录鉴权和获取用户授权
 */
@Component
@Slf4j
public class ShiroRealm extends AuthorizingRealm {

    @Autowired
    @Lazy
    private SysUserService sysUserService;

    @Autowired
    @Lazy
    private SysUserRoleService sysUserRoleService;


    @Override
    public boolean supports(AuthenticationToken token) {
        return token instanceof JwtToken;
    }


    /**
     * 详细授权认证
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {

        String userId = null;
        if (principals != null) {
            SysUserLoginDTO user = (SysUserLoginDTO) principals.getPrimaryPrincipal();
            userId = user.getId();
        }
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();

        // 查找用户角色
        List<String> roles = sysUserRoleService.listRoles(userId);
        info.setRoles(new HashSet<>(roles));

        log.info("++++++++++校验详细权限完成");
        return info;
    }

    /**
     * 校验用户的账号密码是否正确
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken auth) throws AuthenticationException {
        String token = (String) auth.getCredentials();
        if (token == null) {
            throw new AuthenticationException("token为空!");
        }

        // 校验token有效性
        SysUserLoginDTO user = this.checkToken(token);
        return new SimpleAuthenticationInfo(user, token, getName());
    }


    /**
     * 校验Token的有效性
     */
    public SysUserLoginDTO checkToken(String token) throws AuthenticationException {

        // 查询用户信息
        log.debug("++++++++++校验用户token： " + token);

        // 从token中获取用户名
        String username = JwtUtils.getUsername(token);
        log.debug("++++++++++用户名： " + username);

        if (username == null) {
            throw new AuthenticationException("无效的token");
        }

        // 查找登录用户对象
        SysUserLoginDTO user = sysUserService.token(token);

        // 校验token是否失效
        if (!JwtUtils.verify(token, username)) {
            throw new AuthenticationException("登陆失效，请重试登陆!");
        }

        return user;
    }


    /**
     * 清除当前用户的权限认证缓存
     */
    @Override
    public void clearCache(PrincipalCollection principals) {
        super.clearCache(principals);
    }

}
